Glad it's not just me then ! Here's an entire curl request with headers in case that gives any clues (eg if it's particular hosts behind a load balancer)
Cheers -- Tim curl -v "http://api.twitter.com/1/lists.json?callback=abc&screen_name=schmerg"; * About to connect() to api.twitter.com port 80 (#0) * Trying 199.59.148.87... connected * Connected to api.twitter.com (199.59.148.87) port 80 (#0) > GET /1/lists.json?callback=abc&screen_name=schmerg HTTP/1.1 > User-Agent: curl/7.21.4 (i686-pc-linux-gnu) libcurl/7.21.4 GnuTLS/2.10.5 zlib/1.2.5 > Host: api.twitter.com > Accept: */* > < HTTP/1.1 200 OK < Date: Fri, 01 Jul 2011 18:28:34 GMT < Server: hi < Status: 200 OK < X-Transaction: 1309544914-75829-41020 < X-RateLimit-Limit: 150 < ETag: "aab4fa3d9f5ae979ad19a12fa7fcccb0" < X-Frame-Options: SAMEORIGIN < Last-Modified: Fri, 01 Jul 2011 18:28:34 GMT < X-RateLimit-Remaining: 145 < X-Runtime: 0.01157 < X-Transaction-Mask: a6183ffa5f8ca943ff1b53b5644ef114a933ec98 < Content-Type: application/json; charset=utf-8 < Content-Length: 100 < Pragma: no-cache < X-RateLimit-Class: api < X-Revision: DEV < Expires: Tue, 31 Mar 1981 05:00:00 GMT < Cache-Control: no-cache, no-store, must-revalidate, pre-check=0, post-check=0 < X-MID: 3e1aeaa17e566ebc8a4c9b2ebcc4f1a1ebb20bbf < X-RateLimit-Reset: 1309548219 < Set-Cookie: k=78.149.138.182.1309544914102224; path=/; expires=Fri, 08-Jul-11 18:28:34 GMT; domain=.twitter.com < Set-Cookie: guest_id=v1%3A130954491410552515; domain=.twitter.com; path=/; expires=Mon, 01 Jul 2013 06:28:34 GMT < Set-Cookie: _twitter_sess=BAh7CDoPY3JlYXRlZF9hdGwrCLqc9eYwAToHaWQiJWU5Mjc3MmMzNjVlZTIw%250AYTkxMTZiMGI5NjBkNGIzMWNhIgpmbGFzaElDOidBY3Rpb25Db250cm9sbGVy%250AOjpGbGFzaDo6Rmxhc2hIYXNoewAGOgpAdXNlZHsA--fb869e5bba31f66f478b99dc38035752adff4eaa; domain=.twitter.com; path=/; HttpOnly < Vary: Accept-Encoding < Connection: close < * Closing connection #0 {"lists":[], "next_cursor":0, "previous_cursor":0, "next_cursor_str":"0", "previous_cursor_str":"0"} -- Twitter developer documentation and resources: https://dev.twitter.com/doc API updates via Twitter: https://twitter.com/twitterapi Issues/Enhancements Tracker: https://code.google.com/p/twitter-api/issues/list Change your membership to this group: https://groups.google.com/forum/#!forum/twitter-development-talk
